Method paintEvent

src/editor/markdowneditor.cpp:347–610

}

void MarkdownEditor::paintEvent(QPaintEvent *event)
{
    Q_D(MarkdownEditor);
    
    QPainter painter(viewport());
    QRect viewportRect = viewport()->rect();
    painter.fillRect(viewportRect, Qt::transparent);

    QPointF offset(contentOffset());
    QTextBlock block = firstVisibleBlock();

    bool firstVisible = true;

    QRectF blockAreaRect; // Code or block quote rect.
    bool inBlockArea = false;
    MarkdownEditorPrivate::BlockType blockType = MarkdownEditorPrivate::BlockTypeNone;
    bool clipTop = false;
    bool drawBlock = false;
    int dy = 0;
    bool done = false;

    int cornerRadius = 5;

    if (InterfaceStyleSquare == d->editorCorners) {
        cornerRadius = 0;
    }

    // Draw text block area backgrounds for code blocks and block quotes.
    // The backgrounds are drawn per each block area (consisting of multiple
    // text blocks or lines), rather than one rectangle area per text block/
    // line in case there are margins between each text block.  This way,
    // the background will extend to cover the margins between text blocks
    // as well.
    //
    // NOTE: Algorithm for looping through text blocks is a partial lift from
    //       Qt's QPlainTextEdit paintEvent() code. Please refer to the
    //       LGPL v. 3 license for the original Qt code.
    //
    while (block.isValid() && !done) {
        MarkdownEditorPrivate::BlockType prevType;
        
        QRectF r = this->blockBoundingRect(block).translated(offset);

        // If the first visible block is in the middle of a text block area...
        if (firstVisible 
                && d->insideBlockArea(block, blockType)
                && d->insideBlockArea(block.previous(), prevType)
                && (blockType == prevType)) {
            clipTop = true;
            inBlockArea = true;
            blockAreaRect = r;
            dy = 0;
        }
        // If the block begins a new text block area...
        else if (!inBlockArea && d->atBlockAreaStart(block, blockType)) {
            blockAreaRect = r;
            dy = 0;
            inBlockArea = true;